7-Methyl-2-(methylthio)-10H-phenothiazine is synthetic intermediate for analogs of Thioridazine (T368795) which is a dopamine receptor blocker and antipsychotic and it is the parent compound of sulforidazine and mesoridazine. 7-Methyl-2-(methylthio)-10H-phenothiazine is also potentially an impurity of Thioridazine (T368795).